Telephone signaling apparatus



(No Model.) 3 Sheets-Sheet 1.

J. H. GARY.

TELEPHONE SIGNALING APPARATUS.

No. 310,379. Patented Jan. 6,1885.

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n. PETERS. Phuwbmq n her, Washington, n. c.

(No Model.) 3 Sheets-Sheet 2.

.J. H. GARY. TELEPHONE SIGNALING APPARATUS.

N0. 310,379. Patented Jan. 6, 1885.

INVENTUR:

WITNESSESII VM77%@ 0mm N4 FETKRS Pholvlllhbgnphcr Wibhinglm (No Model.) 3 Sheets-Sheet 3.

J. H. OARY.' TELEPHONE SIGNALING APPARATUS. No. 310,379. Patented Jan. 6, 1885.

WITNESSESII |NVENTOR g yfl fiwm UNITED STATES PATENT OFFICE.

JAMES H. CARY, OF BOSTON, MASSACHUSETTS, ASSIGNOB TO THE CARY TELEPHONE SIGNAL COMPANY, OF.POB-TLAND, MAINE.

TELEPHONE SIGNALING APPARATUS.

SPECIFICATION forming part of Letters Patent No.310,379, dated January 6, 1885.

Application filed January 11,1884. (No model.)

T wZZ whom it may concern: I keys with the line, whereby the various quali- Be itknown that I, JAMES H. CARY, of ties of current are sent to line.

Boston, in the county of Suffolk and State of The instrument shown in Figs. 1, 2, and 3 Massachusetts, have invented certain Imis a form of relay, whereby the local battery 5 provements in Telephone Signaling Apparaand hell are thrown in connection by the action 55 tus, of which the following is a specification. of the main battery at the central office upon The object of my invention is to furnish a the electro-magnet and armatures operated simpleand sure means of calling any one stathereby when the proper current is sent to tion out of several located on the same line line. In said figures, Mis an electro-magnct. without causing any signal to be sounded at A is a neutral armature having an upwardly 60 the other stations on the same line. projecting arm, a. B is a permanent magnet The invention consists in an improved sigfreely suspended on screw 1) and acting as a naling system, including aseries of individual polarized armature. O is a stiff spring sc signals, each requiring an operating-current cured upon insulating-block F, and adapted I 5 of electricity differing in quality, as hereinafto make contact with the top of permanent 65 ter described, from those required to operate magnet B, and complete the local circuit upon the other signals, and means for sending the passage of a current of the proper polarithrough the circuit as many different qualities ty. D is a spring fastened upon the back of electric current as there are instruments in board, E, and adapted to make contact with the series. the rod a, attached to the armature A, when 70 In the embodiment of my invention hereinthe proper current is sent to line. G is a bent after described, the different signals or instruspring adapted to bear upon the permanent ments are operated by variations in the magnet B with very light pressure to cause it strength, polarity, and duration of the cur to break contact with spring 0 when no cur- I rent. rent is sent to line, but of insuflicient strength 7 I will now proceed to describe each of the to interfere with the proper action of the cursignals in detail and show their relations to rent upon the magnet B. If is a post on each other, together with calling devices for I which are mounted springs G and G and peroperating the same. manent magnet B. I is a retractile spring Of the accompanying drawings, forming a adapted to act on arm a, thus withdrawing 80 part of this specification, Figure 1 represents the armature Afrom the electro-magnet when a perspective view of one of the instruments I the current has ceased to flow. J is an adbelonging to what I term the first class, justing-screw for regulating the tension of said class being indicated by the numerals 1 spring I. K and K. are springs secured upon 2 3 4 in Fig. 4:. These instruments are caused the back-board for the purpose ol'making con- 85 to operate by constant battery or magneto tact with the angle pieces L L, which are fastcurrents of a definite polarity and strength, ened to the sides of the box, and from which each instrument requiring a current of diii'erthe wires (Z (l extend to the bell-magnet N. ent quality from that required by the others. The operation of the instruments of the 40 Fig. 2 is a plan view of the same instrument. first class is as follows: The polarized arma- 0 Fig. 3 is a perspective view with parts broken ture B is adapted to be attracted against the away, showing the circuits through the inforce of the spring G by a light battery-curstrument, and bell attached. Fig. 4 is a diarent of proper polarity, not of sufficient gram showing a line provided with seven stastrength to attract the neutral armature. Such tionsfour of the first class with bell attached a current being sent, the attraction of the po- 9 5 on local circuit, two bells of the pattern ordilarized armature will cause the upper end of narily known as bipolar bells, operated by said armature to make contact with spring (3, direct current in main line, and the seventh which will complete the local circuit through a regular vibrating magneto -bell; also the the post H and metal frame and standards S, 5 connection of the batteries and generator and pivot-s P, armature A, rod a, spring 1), wire zoo 0, spring K, angle-piece L, wire d, bell magnet N, wired, angle-piece L, spring K, wire f, post 2, wire j, to local battery, thence by wire 7;, post 3, wire 9, to spring 0, thus completing the local-battery circuit and ringing the hell 0.

Vhen the apparatus is operated as above described, the spring D is normally in contact with the rod to, as shown in Figs. 1 and 3, when the neutral armature is not attracted by the magnet M. \Vhen a heavier current is thrown to line sufficient to attract the neutral armature, the contact between said armature and the spring D is broken, so that notwithstanding the current attracting the neutral armature might be the proper polarity to attract the polarized armature also, the bell would not be rung. Another similar instrument in the same circuit may be adapted to be operated only by a current of sufficient strength to attract the neutral armature by simply adjusting the spring D so that when the instrument is in its normal condition or when the light current is sent the contact between rod a and spring D would be broken,

as shown in Fig. 2, until a current of sufficient strength was sent to line to attract thearmature A, when the rod a and spring D would be thrown in contact, thus completing the local circuit, when a current of the proper polarity also is used to attract the polarized armature, as before. Thus it will be seen two bells are adapted to be operated by variations in the strength of the current, the polarity being the same for each bell, each bell rcsponding to its own operating-current, but not to that which operates the other. Two additional instruments similarly constructed may be adapted to be operated respectively by stronger and weaker currents of opposite polarity to those required to operate the two above described. To this end it will be necessary only to make the line-wire enter the instruments of the second pair on the side opposite to that on which it entered the inst-ruments of the first pair. For instance, if the line-wire as it comes from the operating or central office enters in the first pair of instruments at the left or post I, in the second pair it should enter at post at, and the line out would be from post I. Four instruments are thus provided, two of which are operated by weak currents of opposite polarity, and the other two by stronger currents of opposite polarity. The key-boards shown in A and 13 Fig. 4-, are of the ordinary pattern known as reversing-kcys, and enable the currents of either polarity to be sent to operate the in struments, as above described. Another keyboard, C of special construction, is provided, adapted to control the currents from a generator, G", to operate the additional instruments, 5, 6, and 7, in the same line circuit. The key K is in the form of a swinging springswitch. \Vhen in its normal position, it bears against the back contact or are, d, which is connected by wire 0 to earth, or, as is shown by the diagram, to a connection at point E with wires t and 25, thus completing a metallic circuit. The method of operation in this case will be to depress the key upon anvil 1, 2, or 3", respectively, according to the nature of the current desired to be sent to line. The generator G is a magneto-generator of the Siemens armature pattern, provided with the usual brushes for taking the alternating current from the spindles at either end; also with an eccentric, h", for sending the positive or negative current through spring '5 or j respectively, according to which anvil the key K is depressed upon, thus completing circuit through wires (6 or c and key K to line. Bells 5 6, which are of the ordinary bipolar kind, will respond to currents thus sent, respectively, of positive or negative polarity, rapidly broken. Bell 7, which is an ordinary vibrating magneto-bell,will respond to a rapidly-alternating current of less strength, the strength. of the alternating current being diminished by the resistance-coil R which is thrown into the circuit only when bell 7 is to be operated, thus preventing the alternating current from operating bells 5 and 6. The rapidly-broken current as sent from the generator by eccentric h will have no effect upon bells l, 2, 3, and 4;. The reversal of the polarity of the current would cause one tap on hell 7 but that would be readily distinguished from a continuous peal, which constitutes an ordinary signal. The bells 1, 2, 3, and 4: may be operated by magneto-currents, instead of by battery-currents, as will be described and claimed in a future application.

I am aware that it is not new to operate the various signalirig-instruments 011 a line by variations in the polarity or strength of the current, and I do not claim such, broadly.

I claim 1. In a telephone signaling system, a signaling apparatus consisting of an electro-magnet, a polarized armature therefor, a springcontact for the same, a neutral armature carrying a contactarm, and springs and connections, substantially as described, the arrange ment being such that a light current of proper polarity may operate the polarized armature only, while a heavy current may operate the neutral armature alone, or both the polarized and neutral, according to its direction, as set forth.

2. In a telephone signaling system, a signaling apparatus having an electro-magnet, a polarized armature, and a neutral armature therefor adapted to respond, respectively, to weaker and stronger-current, a contactspring, as 0, adapted to make contact with the polarized armature when the latter is attracted by a current of proper polarity, a contact-spring, as D, adapted to be adjusted so as to make contact with an arm on the neutral armature, either when the latter is separated from the poles of the magnet or attracted thereto, and connections, substantially as described,whereby a local circuit may be completed either by the attraction of the polarized armature alone,

or by the simultaneous attraction of both armatures by currents of proper polarity, as set forth.

3. The combination of a generator adapted to send interrupted currents of either polarity, or currents of alternating polarity, with the key K and connections whereby either of said currents may be sent to line, a series of signals adapted to be operated, respectively, by interrupted currents of positive polarity, interrupted currents of negative polarity, and weakened currents of alternating polarity, and a resistance whereby the currents of alternating polarity are weakened, as set forth.

4. The combination,with a generator or generators and circuit-controlling devices whereby currents of varying polarity and strength may be sent to line, of a generator and switch apparatus whereby interrupted currents of either or alternating polarity may be sent to line, and aseries of si gnalirig-instruments, each adapted to be operated by only one of said currents, as set forth.

5. The combination, with a voltaic battery and circuit controlling devices whereby currentsjof varying strength and polarity may be sent to line, of a generator and circuit-eontroller whereby magnetic currents of either polarity or magnetic currents of alternating JAMES H. GARY.

\Vitnesses:

O. F. BROWN, A. L. \Vi-Irrn. 

